CODEWITHSUNDEEP
python-3.xfloating-pointintvalueerror
Prince Singh
Prince Singh

Reputation: 177

int('1.5') VS float('1.5') in python

Why does float('1.5') gives 1.5 as output as expected but int('1.5') gives a value error?

Shouldn't python automatically convert the string into float and then into integer.

Upvotes: 1

Views: 2325

Answers (1)

maio290
maio290

Reputation: 6732

Because 1.5 isn't a valid integer literal which is required by the int() function.

From the docs:

If x is not a number or if base is given, then x must be a string, bytes, or bytearray instance representing an integer literal in radix base.

Whereas integer literals are defined as follows:

integer      ::=  decinteger | bininteger | octinteger | hexinteger
decinteger   ::=  nonzerodigit (["_"] digit)* | "0"+ (["_"] "0")*
bininteger   ::=  "0" ("b" | "B") (["_"] bindigit)+
octinteger   ::=  "0" ("o" | "O") (["_"] octdigit)+
hexinteger   ::=  "0" ("x" | "X") (["_"] hexdigit)+
nonzerodigit ::=  "1"..."9"
digit        ::=  "0"..."9"
bindigit     ::=  "0" | "1"
octdigit     ::=  "0"..."7"
hexdigit     ::=  digit | "a"..."f" | "A"..."F"

Source: https://docs.python.org/3/reference/lexical_analysis.html#integers

Upvotes: 3

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